计算(1)3×(-4)+(-4)2÷(-8)(2)16-3×(-7)2(3)求代

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问题:

计算
(1)3×(-4)+(-4)2÷(-8)
(2)
16
-3×(-
7
2
(3)求代数式(2a2-5a)-2(3a-5+a2)的值,其中a=-1.
考点:实数的运算有理数的混合运算整式的加减
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什么是新时期军队建设的“五句话”的总要求?

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根据《安全生产法》的规定,用于生产、储存危险物品的建设项目,应当按照国家有关规定进行( )。

A.安全环境评估和安全条件论证

B.安全条件论证和安全评价

C.安全条件评价和安全论证

D.安全环境条件论证和安全影响评价

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D

Providing small classes for at least several grades starting in early primary school gives students the best chance to succeed in late grades, according to groundbreaking new research from a Michigan State University scholar.

The research by Spyros Konstantopoulos, a professor of education, is the first to examine the effects of class size over a period and for all levels of students. The study appears in the American Journal of Education.

He is also a member of a group for the Department of Education’s Instiute of Education Sciences that will give official advice on class size to the states. He said the advice will mirror his research: the best plan is to provide continuous small classes(13 to 17 students) for at least several years starting in kindergarten or first grade.

“For a logn time states thought they could just do it in kindergarten or first grade for one year and get the benefits,” He said. “I don’t believe that. I think you need at least a few years in a row where all students, and especially low-achievers, receive the treatment, and then you see the benefits later.”

His research used data from the Project Star study in Tennessee that analyzed the effects of class size on more than 11,000 students in primary and middle school. He found that students who had been in small classes from kindergarten through third grade had actually higher test scores in grades four through eight than students who been in larger classes early on.

Students from all achievement levels benefited from small classes, the research found. “But low-achievers benefited the most, which narrowed the achievement gap with high –achievers in science, reading and math, ” he said.

Although the study didn’t consider classroom practices, he said the reason for the narrowing gap is likely due to low-achieving students receiving more attention from teachers.

“This is especially important in poorer schools because teacher effectiveness matters more in schools with more disadvantaged and low-performing students, ” he said.

48.The professor argues about ________ .

A.the size of the class

B.the period of the class

C.the attention from teachers

D.the achievements of students

49.The result of the research shows that _________.

A.small classes for one year in early grade are enough

B.continuous small classes help students achieve more

C.it’s best to attend small classes in kindergarten

D.small classes do equal good to students of all levels

50.What can we infer from the passage?

A.High achievers will not benefit from small classes.

B.Continuous small classes have not been widely accepted.

C.Low-achievers should be separated from high-achievers.

D.Teachers’ attention matters less than classroom practices.

51.The underlined word “This” in the last paragraph refers to _______.

A.the gap between low and high achievers

B.continuous small classes

C.classroom practices in later grades

D.the Project Star Sturdy

题型:解答题

肾实质不显影常见于哪种疾病()

A.肾功能减退

B.尿路梗阻

C.肾结核

D.肾脓肿

E.肾血管性病变

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根据以下案例,回答下列问题:
风险存在于人类生产与生活中的方方面面,给人们的生产、生活造成严重威胁,人们自然产生对风险进行管理的需要,以减少其发生的频率和损失。首先理财规划师需要对风险有一个明确地认识,进而才能采取相应的措施或转移风险,或控制损失。

( )是指个人和家庭或企业对其所有的、使用的和保管的财产发生财产贬值、损毁或者灭失的风险。

A.财务风险

B.人身风险

C.财产风险

D.经济风险

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